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Math Help - Geometry question on viewable degrees

  1. #1
    McJ
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    Question Geometry question on viewable degrees



    Could anyone help me understand the green question.

    Thank you.
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  2. #2
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    Quote Originally Posted by McJ View Post

    Could anyone help me understand the green question.

    Thank you.
    Hello,

    I've attached a sketch of the situation (see attachment)

    The viewable angle of the earth looking from a satelite S_a is twice as large as the angle \alpha.

    The satelite, the center of the earth and the radius of the earth form a right triangle.

    \sin(\alpha)=\frac{R}{R+d}

    If you know d then you can calculate the viewable angle = 2\cdot \alpha with R = 6365 km.
    Attached Thumbnails Attached Thumbnails Geometry question on viewable degrees-satellite_winkl.gif  
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    McJ
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    Thank you so much for your time.
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